US4219618A - Dental hand tool holder - Google Patents

Dental hand tool holder Download PDF

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Publication number
US4219618A
US4219618A US05/867,100 US86710078A US4219618A US 4219618 A US4219618 A US 4219618A US 86710078 A US86710078 A US 86710078A US 4219618 A US4219618 A US 4219618A
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US
United States
Prior art keywords
external
inlet port
internal
chamber
outlet passage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US05/867,100
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English (en)
Inventor
Henri Leonard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Micro Mega SA
Original Assignee
Micro Mega SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from FR7702946A external-priority patent/FR2378499A1/fr
Priority claimed from FR7708749A external-priority patent/FR2383652A2/fr
Application filed by Micro Mega SA filed Critical Micro Mega SA
Application granted granted Critical
Publication of US4219618A publication Critical patent/US4219618A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C1/00—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design
    • A61C1/02—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design characterised by the drive of the dental tools
    • A61C1/05—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design characterised by the drive of the dental tools with turbine drive
    • A61C1/052—Ducts for supplying driving or cooling fluid, e.g. air, water
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C1/00—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design

Definitions

  • the present invention relates in general to tools used in dentistry and has specific reference to an improved dental handpiece.
  • this invention refers to improvements in dental handpieces comprising essentially an elongated socket in which a central shaft is rotatably mounted for driving a tool adapted to be secured to the head of the handpiece, the rear end of the socket being adapted to be coupled or operatively connected to a driving member adapted in turn to rotate freely on the handpiece, an internal inlet aperture being provided in the coupling end of the socket to permit the supply of cooling fluid to the tool and communicating with an outlet passage directing said cooling fluid to the head of the handpiece.
  • a dental handpiece of the type broadly set forth hereinabove which comprises suitable means for eliminating any handling step for connecting or disconnecting the cooling fluid conduits provided on the micro-motor and the handpiece, respectively, when coupling or uncoupling the latter.
  • This means is disposed internally of the handpiece and also of the micro-motor in the coupling area thereof in order to afford a free relative rotary motion.
  • a handpiece of this type it is contemplated as a rule to utilize a special driving member also provided in the coupling area with an internal passage for receiving the cooling fluid.
  • an improved dental handpiece characterized in that it comprises an external inlet port or like aperture adapted to be connected to an external cooling-fluid supply hose, this port communicating with the outlet passage via a chamber into which said internal inlet aperture opens directly, a valve member mounted in said chamber and having two positions, namely a first position in which said internal inlet port is closed so that the circulation of cooling fluid between said external inlet port and said outlet passage can take place, and another position in which said external port is closed and the circulation of cooling fluid said internal inlet port and said outlet passage can take place.
  • FIG. 1a is a part-elevational, part-sectional view showing the rear end of a dental handpiece in accordance with the invention adapted to be coupled to an obsolete micro-motor not provided with an internal passage for supplying cooling fluid to the dental tool, the micro-motor being shown only partially in the Figure;
  • FIG. 1b is a view similar to FIG. 1a with the handpiece adapted to be coupled to another micro-motor (not shown) of the type provided with an internal passage for the cooling fluid:
  • FIGS. 2a and 2b are fragmentary elevational and sectional views of a modified form of embodiment of the improved dental handpiece adapted to be coupled to a micro-motor with or without internal fluid passage, respectively;
  • FIGS. 3a, 3b, to 8a, 8b illustrate also in fragmentary elevational and sectional views, respectively, third to eighth forms of embodiment of the improved dental handpiece of this invention
  • FIG. 9a is an elevational and sectional view of a ninth form of embodiment of the dental handpiece intended for coupling with a micro-motor provided with an internal passage;
  • FIG. 9b is a cross-sectional view of the same handpiece as in FIG. 9a but adapted for coupling to a micro-motor provided with an internal passage;
  • FIG. 10a is a part-elevational, part-sectional view of a tenth form of embodiment of the dental handpiece adapted to be coupled to a micro-motor without internal passage;
  • FIG. 10b is a cross sectional view of the handpiece shown in FIG. 10a but adapted to be connected to a micro-motor provided with an internal passage;
  • FIG. 11 is a sectional view of the rear end of a modified form of embodiment of the dental handpiece, the section being taken along the line XI--XI of FIG. 13;
  • FIG. 12 is a fragmentary sectional view taken along the line XII--XII of FIG. 13, and
  • FIG. 13 is a cross section taken along the line XIII--XIII of FIG. 11.
  • the dental handpiece 1 has formed therein a radial inlet port 2 for supplying cooling fluid to the tool (not shown).
  • This port 2 communicates with an outlet passage 3 directing the cooling fluid to the head of the handpiece.
  • an external outlet port 4 in radial alignment with the internal inlet port 2 and also communicating with the outlet passage 3 is also provided.
  • a valve member 5 is fitted in a chamber 6 disposed between ports 2 and 4 opening directly therewith like the outlet passage 3 in axial alignment with said chamber 6.
  • This valve member 5 fills the chamber 6 completely and comprises an axial blind cavity 7 having radial or perpendicular extension at its inner end, as shown.
  • This valve member is formed integrally with a blind or solid axial extension 8 of which the head is flush with the rear end face of the handpiece 1.
  • FIG. 1a shows only diagrammatically the coupling end of micro-motor 10 to which the handpiece 1 is secured in the known fashion by means of a spring-loaded device.
  • the micro-motor 10 does not comprise an internal passage for delivering cooling fluid to the tool.
  • the outlet passage 3 of handpiece 1 may be either completely internal and formed longitudinally in the wall of the body of handpiece 1, or only partially internal in the rear coupling end thereof so that it can be connected to an external hose.
  • valve member 5 When the handpiece 1 is to be associated with a micro-motor 10 without any internal passage for supplying cooling fluid to the tool, as exemplified in FIG. 1a, valve member 5 is positioned to connect the external inlet port 4 via the internal passage 7 to the outlet passage 3 while closing the communication between the other or internal inlet port 2 and the outlet passage 3.
  • the cooling fluid may circulate in the direction shown by the arrows.
  • the inlet port 4 may consist of a tapped hole connected through a union 9 screwed therein to a flexible hose fitted into the central hole of this union, as shown.
  • valve member 5 When the handpiece 1 is to be associated with or coupled to a micro-motor 10 provided with an internal passage for supplying cooling fluid to the tool (FIG. 1b), the valve member 5 is rotated by means of a screw driver (not shown) through 180° in chamber 6, from its position shown in FIG. 1a, in order to set this valve member 5 in the position shown in FIG. 1b and connect the inner port 2 via the internal passage 7 of valve member 5 to the outlet passage 3 of handpiece 1 while closing the communication between the external inlet port 4 and the outlet passage 3.
  • the rear end of rod 8 is provided with a diametral screwdriver slot 8a and also with a reference mark for displaying the setting of the internal passage 7 of valve member 5.
  • the dental handpiece 11 for the purpose of simplifying its manufacture and the machining of its component elements, consists of two sockets, namely an internal socket 11a screwed or snug fitted in an external socket 11b.
  • An internal inlet port 12, an outlet passage 13 and an external inlet port 14 open into a chamber 16, respectively.
  • the dimensions of this chamber 16 are such that two annular sealing members 15, 15' for example in the form of ring having a rectangular cross-section may be fitted alternatively in the device. More particularly, the first ring 15 (FIG.
  • the external inlet port 14 is adapted to fit snuggly in a first groove 16a formed in chamber 16 so that the fluid fed to the device through the external inlet port 14 can flow freely to the outlet passage 13 while closing the internal inlet port 12.
  • the other ring 15' (FIG. 2b) is adapted on the other hand and alternatively to fit snuggly in another groove 16b so as to close the communication between the external inlet port 14 and the outlet passage 13 while permitting the flow of fluid from the internal inlet port 12 and said passage 13.
  • O-rings 17, 18 are provided for sealing the mutually engaging surfaces of the outer socket 11a and internal socket 11b, as shown.
  • the external inlet port 14 may also be connected to the supply hose (not shown) via a hollow union (not shown).
  • the inner socket 11a of the handpiece when it is desired to couple the handpiece 11 to a micro-motor provided or not with an internal passage for the cooling fluid, the inner socket 11a of the handpiece must be disassembled and one of the sealing rings 15, 15' must be positioned in the corresponding groove 16a or 16b; however, this conversion should preferably be carried out by the manufacturer.
  • FIGS. 1a, 1b and 2a, 2b of the drawings as well as in all the other Figures to which reference will be made subsequently in this specification, the arrows show the direction of flow of the cooling fluid.
  • the dental handpiece 21 illustrated therein comprises likewise a pair of sockets 21a, 21b assembled to each other for example by screw engagement.
  • a pair of seals 25, 25' consisting each of an O-ring may be fitted manually and alternatively, the one 25 into a first circular cavity 26a (FIG. 3a), in order to close the communication between the internal inlet port 22 and the outlet passage 23, for adapting the handpiece to a micro-motor without internal passage, and the other 25' into another circular cavity 26b (FIG.
  • FIGS. 4a and 4b illustrate another form of embodiment wherein the dental handpiece 31 can be adapted automatically to either micro-motor types.
  • the valve member consists of a ball 35 enclosed in a chamber 36 directed forwardly and inwardly in a radial plane and adapted to move from one valve seat 37 to another valve seat 38, and vice versa.
  • a first valve seat 38 is formed at the end of an external inlet port 34 forming the outward extension of the oblique chamber 36, this valve seat being formed at the inner end of a tubular insert 39 force fitted into the outer end portion of the external inlet port 34.
  • Another valve seat 37 is formed at the outer end of a radial internal inlet port 32 opening at its opposite end into said oblique chamber 36.
  • the outlet passage 33 also opens into this oblique chamber 36 between the two ports 32 and 34.
  • FIGS. 5a and 5b illustrate a fifth form of embodiment of the dental handpiece 41 comprising the outlet passage 43, the chamber 46 and the internal and external inlet ports 42 and 44 which, in this case, are aligned radially to each other.
  • the external inlet port 44 is tapped and the internal inlet port 42 constitutes a valve seat at its end adjacent chamber 46.
  • a union 48 is screwed into the tapped port 44; this union 48 is adapted to be connected to the supply hose and provided with a longitudinal axial passage opening into a diametral orifice 47 formed across this union and opening in turn into chamber 46 communicating with the outlet passage 43.
  • union 48 is closed and its length is such that when this union 48 is screwed home in port 44, its inner end 45 acts as a plug by engaging the valve seat formed in the internal inlet port 42 so as to close the communication between this inlet port 42 and the outlet passage 43.
  • FIGS. 6a and 6b illustrate a form of embodiment almost similar to the preceding one, with the only difference that the internal inlet port 52 opening into chamber 56 is tapped and has the same diameter as the tapped external inlet port 54, so that the same plug 59 may be used for closing this external inlet port 54 (FIG. 6b) and permit the communication between the internal inlet port 52 and the outlet passage 53, i.e. for closing the internal inlet port 52 (FIG. 6a) and closing said communication.
  • a union 58 is also provided for connecting the external inlet port 54 to the external supply hose (not shown).
  • O-rings 57, 57' are also disposed between the two sockets constituting the body of the handpiece.
  • the internal inlet port 62 is also aligned radially with the external inlet port 64. Both ports 62 and 64 open into a chamber 66 from which an outlet passage 63 extends to the front or head of the handpiece.
  • a seal 66' consisting of a block of suitable elastomeric material having the same radial section as chamber 66 is enclosed in this chamber and has a radial hole 68' formed therethrough in alignment with ports 62 and 64, another hole 68 formed at right angles to hole 68' and to the longitudinal axis of the elastomer seal 68' connecting this radial hole 68' to the outlet passage 63.
  • a plug 69 acting as a union between the device and an external supply hose is screwed in the external inlet port 64 and has a central blind orifice 67 formed therein, and a radial hole is also formed in this plug and opens into the central orifice 67, as shown.
  • the solid inner end 65 of plug 69 constitutes the valve member proper.
  • the shape and dimensions of this plug 69 are such that when the latter is screwed home in the external inlet port 64 (FIG.
  • the radial orifice of plug 67 is aligned with the longitudinal hole 68 of seal 66', this permitting the communication between the external inlet port 64 and the outlet passage 63, while the valve-forming solid end portion 65 of said plug 67 closes the radial orifice 68' of seal 66' to prevent any fluid communication between the internal inlet port 62 and the outlet passage 63.
  • the seal 75 of elastomeric material has the shape of a circular segment and is fitted on the outer periphery of the internal socket 71a so as to fill completely the chamber 76 formed between said internal socket 71a and the external socket 71b; the axes of the external and internal inlet ports 74, 72 opening into this chamber 76 lie on a common transverse plane but are shifted angularly from each other.
  • the seal 75 is provided with a pair of elbow-forming orifices 77, 78 having opposite directions, shifted angularly and so disposed as to cause the outlet passage 73 to communicate either with the external inlet port 74 (FIG.
  • the internal inlet port 82 is also radially aligned with the external inlet port 84, both ports opening into a chamber 86 from which the outlet passage 83 extends towards the head of the handpiece.
  • the valve member consists in this example of a small diaphragm 85 fitted in chamber 86 and movable to one or the other of two positions as a function of the mode of supplying cooling fluid to said head.
  • the diaphragm 85 is urged by the fluid pressure against the top or outer wall of chamber 86 to close the communication between the external inlet port 84 and the outlet passage 83 while permitting the flow of fluid from the internal inlet port 82 to said outlet passage 83.
  • FIGS. 10a and 10b show a tenth form of embodiment of the dental handpiece according to this invention, wherein the internal and external inlet ports 92 and 94, respectively, are located in a same radial plane but shifted angularly from each other by the angular extent of a common chamber 93 consisting of a segment-shaped groove formed in the surface of the external socket 91b that contacts the internal socket 91a.
  • the inlet ports 92, 94 are located at and open into the opposite ends of chamber 96, and the outlet passage 93 is equally spaced from said ports.
  • the inlet ports are separated from each other by an angle of 180°, but of course other angles of shift may be contemplated without departing from the basic principle of the invention.
  • the valve member consists of a ball 95 of rubber of other suitable plastic material; the diameter of this ball 95 is somewhat greater than that of the inlet ports opening into said chamber 96, and the ball valve can move from one end to the other end of chamber 96 for closing one or the other of the pair of ports 92, 94.
  • the movement of ball valve 95 due to the fluid pressure depends on which inlet port is connected to the fluid feed line.
  • FIG. 10b illustrates in thick lines the ball 95 in the position obtained when the handpiece is coupled to a micro-motor having an internal passage and in dash lines the position of said ball 95 when the handpiece is coupled to a micro-motor without internal passage.
  • the switching of the handpiece from one to the other type of micro-motor is therefore automatic as in the preceding example.
  • FIGS. 11 to 13 of the drawings illustrate an eleventh form of embodiment of the invention which simplifies considerably the switching of the handpiece from one to the other type of micro-motor to be utilized, this switching being obtained by simply rotating a ring member, i.e. without compelling the user to disassemble a socket or resorting to a suitable or special tool.
  • the dental handpiece 101 of which only the rear end adapted to be coupled to the driving micro-motor is illustrated, comprises an external socket 102 having an internal socket 103 screwed therein.
  • This external socket 103 comprises: a longitudinal outlet passage 104 adapted to convey the cooling fluid to the head of the device; an external inlet port 105 adapted to supply cooling fluid to the handpiece from a suitable external source such as an external hose; and an internal inlet port 106 for supplying cooling fluid to the handpiece from an internal source such as the passage formed in the micro-motor coupled to the device.
  • the internal inlet port 106 communicates with a circular groove 107 formed on the external surface of internal socket 103, a radial hole 108 permitting the communication between said circular groove 107 and a second circular groove 107a formed on the inner surface of the internal socket 103, a radial hole formed in the micro-motor (not shown) opening into said second circular groove which communicates on the other hand with the internal supply passage formed in said micro-motor.
  • This internal inlet port 106 is inclined forwardly and inwardly from the inner surface of external socket 102 to the end surface thereof.
  • the external inlet port 105 is L-shaped and its end opening into the outer surface of the external socket 102 is screw-threaded for engagement either by a union 121 connected to the external fluid supply hose when the hand tool holder is coupled to a micro-motor without internal fluid passage or by a plug when this port must be closed for coupling the handpiece to a motor provided with an internal fluid passage.
  • the outlet passage 104, external inlet port 105 and internal inlet port 106 open into the rear end surface 109 of the external socket 102, the outlet passage 104 being disposed asymmetrically between the internal and external inlet ports 106 and 105 located at diametrally opposite locations.
  • a rotary ring 110 is disposed at the end of said external socket 102 and retained between this external socket 102 and a shoulder 111 of the internal socket 103.
  • the face of the rotary ring 110 which is adjacent the end surface 109 of the external socket 102 has two grooves 112, 113 formed therein.
  • These grooves have the shape of circular arcs, and the length of the first groove 112 is such that it provides a fluid connection between the outlet passage 104 and either the external inlet port 105 or the internal inlet port 106; besides, the second groove 113 is adapted to co-act with a pin 114 force-fitted into a blind hole formed in and projecting from the end surface of the external socket 102 for limiting and guiding the angular movements of said rotary ring 110 in relation to the external socket 102.
  • grooves 112 and 113 are so selected that when pin 114 abutes a first end of groove 113, the other groove 112 permits the communication between the outlet passage 104 and, for example, the internal inlet port 106, as illustrated in FIG. 13, and that when said ring 110 is rotated until pin 114 abuts the opposite end of groove 113, the other groove 112 provides a free communication between the outlet passage 104 and the external inlet port 105, as illustrated in dash and dot lines in FIG. 13.
  • the asymmetrical position of outlet passage 104 between the two inlet ports 105 and 106 permits an appreciable reduction of the angular excursion of rotary ring 110 with respect to the external socket 102.
  • a plastic or rubber gasket or seal 115 Disposed between the end surface of external socket 102 and the rotary ring 110 is a plastic or rubber gasket or seal 115 in the form of an annular washer provided at the locations corresponding to the inlet ports 105 and 106 and to outlet passage 104 with adequate holes, this gasket 115 being retained in contact with the end surface of the external socket 102 by said pin 114 extending through a corresponding orifice 116; on the other hand, this gasket 115 is fitted in a chambered portion 117 of said rotary ring 110.
  • O-rings 118 are disposed between the internal socket 103 and the external socket 102.
  • the rotary ring 110 on its face opposite the one in which the grooves 112 and 113 are formed, comprises another groove 119 in which another O-ring 120 is fitted.
  • reference marks may be provided on the external socket and on the rotary ring for displaying at any time which specific inlet port is connected to the outlet passage of the device.
US05/867,100 1977-01-28 1978-01-05 Dental hand tool holder Expired - Lifetime US4219618A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR7702946A FR2378499A1 (fr) 1977-01-28 1977-01-28 Piece a main dentaire
FR7702946 1977-01-28
FR7708749A FR2383652A2 (fr) 1977-03-18 1977-03-18 Piece a main dentaire
FR7708749 1977-03-18

Publications (1)

Publication Number Publication Date
US4219618A true US4219618A (en) 1980-08-26

Family

ID=26219836

Family Applications (1)

Application Number Title Priority Date Filing Date
US05/867,100 Expired - Lifetime US4219618A (en) 1977-01-28 1978-01-05 Dental hand tool holder

Country Status (10)

Country Link
US (1) US4219618A (de)
JP (1) JPS5394494A (de)
AR (1) AR213674A1 (de)
AT (1) AT350712B (de)
BR (1) BR7800373A (de)
CH (1) CH614619A5 (de)
DD (1) DD135560A5 (de)
DE (1) DE2750451C3 (de)
IT (1) IT1088979B (de)
PL (1) PL112648B1 (de)

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Also Published As

Publication number Publication date
DE2750451C3 (de) 1981-11-19
AR213674A1 (es) 1979-02-28
DD135560A5 (de) 1979-05-16
CH614619A5 (de) 1979-12-14
ATA822077A (de) 1978-11-15
JPS5394494A (en) 1978-08-18
PL112648B1 (en) 1980-10-31
DE2750451B2 (de) 1981-03-12
BR7800373A (pt) 1978-08-22
AT350712B (de) 1979-06-11
IT1088979B (it) 1985-06-10
PL203791A1 (pl) 1978-07-31
DE2750451A1 (de) 1978-08-03

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